The son of Holy Roman Emperor and King of Spain Charles V and Isabella of Portugal, Philip was called "Felipe el Prudente" ("Philip the Prudent") in Spain; his empire included territories on every continent then known to Europeans, including his namesake the Philippines. During his reign, Spain reached the height of its influence and power. This is sometimes called the Spanish Golden Age. The expression "the empire on which the sun never sets" was coined during Philip's time to reflect the extent of his dominion.

Philip was described by the Venetian ambassador Paolo Fagolo in 1563 as "slight of stature and round-faced, with pale blue eyes, somewhat prominent lip, and pink skin, but his overall appearance is very attractive". The Ambassador went on to say "He dresses very tastefully, and everything that he does is courteous and gracious."[4] Besides Mary I, Philip was married three other times and widowed four times.

The son of Charles I and V, King of Spain and Holy Roman Emperor and his wife, Isabella of Portugal, Philip was born in the Spanish capital of Valladolid on 21 May 1527 at Palacio de Pimentel, which was owned by Don Bernardino Pimentel (the first Marqués de Távara). The culture and courtly life of Spain were an important influence in his early life. He was tutored by Juan Martínez Siliceo, the future Archbishop of Toledo. Philip displayed reasonable aptitude in arts and letters alike. Later he would study with more illustrious tutors, including the humanist Juan Cristóbal Calvete de Estrella. Though Philip had good command over Latin, Spanish, and Portuguese, he never managed to equal his father, Charles V, as a polyglot. While Philip was also a German archduke of the House of Habsburg, he was seen as a foreigner in the Holy Roman Empire. The feeling was mutual. Philip felt himself to be culturally Spanish; he had been born in Spain and raised in the Castilian court, his native tongue was Spanish, and he preferred to live in Spain. This would ultimately impede his succession to the imperial throne.[5]

In April 1528, when Philip was eleven months old, he received the oath of allegiance as heir to the crown from the Cortes of Castile. From that time until the death of his mother Isabella in 1539, he was raised in the royal court of Castile under the care of his mother and one of her Portuguese ladies, Dona Leonor de Mascarenhas, to whom he was devotedly attached. Philip was also close to his two sisters, María and Juana, and to his two pages, the Portuguese nobleman Rui Gomes da Silva and Luis de Requesens, the son of his governor Juan de Zúñiga. These men would serve Philip throughout their lives, as would Antonio Pérez, his secretary from 1541.

Philip's martial training was undertaken by his governor, Juan de Zúñiga, a Castilian nobleman who served as the commendador mayor of Castile. The practical lessons in warfare were overseen by the Duke of Alba during the Italian Wars. Philip was present at the Siege of Perpignan in 1542 but did not see action as the Spanish army under Alba decisively defeated the besieging French forces under the Dauphin of France. On his way back to Castile, Philip received the oath of allegiance of the Aragonese Cortes at Monzón. His political training had begun a year previously under his father, who had found his son studious, grave, and prudent beyond his years, and having decided to train and initiate him in the government of Spain. The king-emperor's interactions with his son during his stay in Spain convinced him of Philip's precocity in statesmanship, so he determined to leave in his hands the regency of Spain in 1543. Philip, who had previously been made the Duke of Milan in 1540, began governing the most extensive empire in the world at the young age of sixteen.

Charles left Philip with experienced advisors—notably the secretary Francisco de los Cobos and the general Duke of Alba. Philip was also left with extensive written instructions that emphasised "piety, patience, modesty, and distrust." These principles of Charles were gradually assimilated by his son, who would grow up to become grave, self-possessed and cautious. Personally, Philip spoke softly and had an icy self-mastery; in the words of one of his ministers, "he had a smile that cut like a sword."[6]

After living in the Netherlands in the early years of his reign,[7] Philip II decided to return to Spain. Although sometimes described as an absolute monarch, Philip faced many constitutional constraints on his authority, influenced by the growing strength of the bureaucracy. The Spanish Empire was not a single monarchy with one legal system but a federation of separate realms, each jealously guarding its own rights against those of the House of Habsburg. In practice, Philip often found his authority overruled by local assemblies, and his word less effective than that of local lords.[8]

In his will Charles stated his doubts over Navarre and recommended that his son give the kingdom back. Both King Charles and his son Philip II failed to abide by the elective (contractual) nature of the Crown of Navarre, and took the kingdom for granted. This sparked mounting tension not only with King Henry II and Queen Jeanne III of Navarre, but also with the Parliament of the Spanish Navarre (Cortes, The Three States) and the Diputación for breach of the realm specific laws (fueros)—violation of the pactum subjectionis as ratified by Ferdinand. Tensions in Navarre came to a head in 1592 after several years of disagreements over the agenda of the intended parliamentary session.

In November 1592, the Parliament (Cortes) of Aragón revolted against another breach of the realm-specific laws, so the Attorney General (Justicia) of the kingdom, Juan de Lanuza, was executed on Philip II's orders, with his secretary Antonio Perez taking exile in France. In Navarre the major strongholds of the kingdom were garrisoned by troops alien to the kingdom (Castilians) in conspicuous violation of the laws of Navarre, and the Parliament had long been refusing to pledge loyalty to Philip II's son and heir apparent without a proper ceremony. On 20 November 1592 a ghostly Parliament session was called, pushed by Philip II, who had arrived in Pamplona at the head of an unspecified military force, and with one only point on his agenda—attendance to the session was kept blank on the minutes: unlawful appointments of trusted Castilian officials and an imposition of his son as future king of Navarre at the Santa Maria Cathedral. A ceremony was held before the bishop of Pamplona (22 November), but its customary procedure and terms were altered. Protests erupted in Pamplona, but they were quelled.

Philip II also grappled with the problem of the large Morisco population in Spain, who were sometimes forcibly converted to Christianity by his predecessors. In 1569, the Morisco Revolt broke out in the southern province of Granada in defiance of attempts to suppress Moorish customs. Philip ordered the expulsion of the Moriscos from Granada and their dispersal to other provinces.

Despite its immense dominions, Spain was a country with a sparse population that yielded a limited income to the crown (in contrast to France, for example, which was much more heavily populated). Philip faced major difficulties in raising taxes, and collection was largely farmed out to local lords. He was able to finance his military campaigns only by taxing and exploiting the local resources of his empire. The flow of income from the New World proved vital to his militant foreign policy, but nonetheless his exchequer several times faced bankruptcy.

Spanish culture flourished during Philip's reign, beginning the "Spanish Golden Age", creating a lasting legacy in literature, music, and the visual arts. One of the notable artists from Phillip II's court was Sofonisba Anguissola, who gained fame for her talent and unusual role as a woman artist. She was invited to the court of Madrid in 1559 and was chosen to become an attendant to Isabella Clara Eugenia (1566–1633). Anguissola also became a lady-in-waiting and court painter for the queen, Elizabeth de Valois. During her time as a court painter, Anguissola painted many official portraits of the royal family, a sharp departure from her previous personal portraits.

Charles V had left his son Philip with a debt of about 36 million ducats and an annual deficit of 1 million ducats. This debt caused Phillip II to default on loans in 1557, 1560, 1575, and 1596 (including debt to Poland, known as Neapolitan sums). Lenders had no power over the King and could not force him to repay his loans. These defaults were just the beginning of Spain's economic troubles as its kings would default six more times in the next 65 years.[9] Aside from reducing state revenues for overseas expeditions, the domestic policies of Philip II further burdened Spain and would, in the following century, contribute to its decline, as maintained by some historians.[10]

Spain was subject to different assemblies: the Cortes in Castile, the assembly in Navarre, and one each for the three regions of Aragon, which preserved traditional rights and laws from the time when they were separate kingdoms. This made Spain and its possessions difficult to rule, unlike France, which while divided into regional states, had a single Estates-General. The lack of a viable supreme assembly led to power defaulting into Philip II's hands, especially as manager and final arbiter of the constant conflict between different authorities. To deal with the difficulties arising from this situation, authority was administered by local agents appointed by the crown and viceroys carrying out crown instructions. Philip II felt it necessary to be involved in the detail, and he presided over specialised councils for state affairs, finance, war, and the Inquisition.

Philip II played groups against each other, leading to a system of checks and balances that managed affairs inefficiently, even to the extent of damaging state business, as in the Perez affair. Following a fire in Valladolid in 1561, he resisted calls to move his Court to Lisbon, an act that could have curbed centralisation and bureaucracy domestically as well as relaxed rule in the Empire as a whole. Instead, with the traditional Royal and Primacy seat of Toledo now essentially obsolete, he moved his Court to the Castilian stronghold of Madrid. Except for a brief period under Philip III of Spain, Madrid has remained the capital of Spain. It was around this time that Philip II converted the Royal Alcázar of Madrid into a royal palace. The works, which lasted from 1561 until 1598, were done by tradesmen that came from the Netherlands, Italy, and France.

King Philip II ruled at a critical turning point in European history toward modernity whereas his father Charles V had been forced to an itinerant rule as a medieval king. He mainly directed state affairs, even when not at Court. Indeed, when his health began failing, he worked from his quarters at the Palace-Monastery-Pantheon of El Escorial that he had built in 1584, a palace built as a monument to Spain's role as a center of the Christian world. But Philip did not enjoy the supremacy that King Louis XIV of France would in the next century, nor was such a rule necessarily possible at his time. The inefficiencies of the Spanish state and the restrictively regulated industry under his rule were common to many contemporary countries. Further, the dispersal of the Moriscos from Granada – motivated by the fear they might support a Muslim invasion – had serious negative effects on the economy, particularly in that region.

Philip's foreign policies were determined by a combination of Catholic fervour and dynastic objectives. He considered himself the chief defender of Catholic Europe, both against the Ottoman Turks and against the forces of the Protestant Reformation. He never relented from his fight against heresy, defending the Catholic faith and limiting freedom of worship within his territories.[11] These territories included his patrimony in the Netherlands, where Protestantism had taken deep root. Following the Revolt of the Netherlands in 1568, Philip waged a campaign against Dutch heresy and secession. It also dragged in the English and the French at times and expanded into the German Rhineland with the Cologne War. This series of conflicts lasted for the rest of his life. Philip's constant involvement in European wars took a significant toll on the treasury and caused economic difficulties for the Crown and even bankruptcies.

In 1588, the English defeated Philip's Spanish Armada, thwarting his planned invasion of the country to reinstate Catholicism. But war with England continued for the next sixteen years, in a complex series of struggles that included France, Ireland and the main battle zone, the Low Countries. It would not end until all the leading protagonists, including himself, had died. Earlier, however, after several setbacks in his reign and especially that of his father, Philip did achieve a decisive victory against the Turks at the Lepanto in 1571, with the allied fleet of the Holy League, which he had put under the command of his illegitimate brother, John of Austria. He also successfully secured his succession to the throne of Portugal.

With regard to Philip's overseas possessions, in response to the reforms imposed by the Ordenanzas, extensive questionnaires were distributed to every major town and region in New Spain called relaciones geográficas. These surveys helped the Spanish monarchy to govern these overseas conquests more effectively.

Charles V abdicated the throne of Naples to Philip on 25 July 1554, and the young king was invested with the kingdom (officially called "Naples and Sicily") on 2 October by Pope Julius III. The date of Charles' abdication of the throne of Sicily is uncertain, but Philip was invested with this kingdom (officially "Sicily and Jerusalem") on 18 November 1554 by Julius.[12] In 1556, Philip decided to declare war in the Papal States and temporarily held territory there, perhaps in response to Pope Paul IV's anti-Spanish outlook. According to Philip II, he was doing it for the benefit of the Church.

In a letter from Francisco de Vargas to the Princess Dowager of Portugal, Regent of Spain, dated 22 September 1556, it is written:

"I have reported to your Highness what has been happening here, and how far the Pope is going in his fury and vain imaginings. His Majesty could not do otherwise than have a care for his reputation and dominions. I am sure your Highness will have had more recent news from the Duke of Alva, who has taken the field with an excellent army and has penetrated so far into the Pope's territory that his cavalry is raiding up to ten miles from Rome, where there is such panic that the population would have run away had not the gates been closed. The Pope has fallen ill with rage, and was struggling with a fever on the 16th of this month. The two Carafa brothers, the Cardinal and Count Montorio, do not agree, and they and Piero Strozzi are not on as good terms as they were in the past. They would like to discuss peace. The best thing would be for the Pope to die, for he is the poison at the root of all this trouble and more which may occur. His Majesty's intention is only to wrest the knife from this madman's hand and make him return to a sense of his dignity, acting like the protector of the Apostolic See, in whose name, and that of the College of Cardinals, his Majesty has publicly proclaimed that he has seized all he is occupying. The Pope is now sending again to the potentates of Italy for help. I hope he will gain as little thereby as he has done in the past, and that the French will calm down. May God give us peace in the end, as their Majesties desire and deserve!"[13]

Pope Paul IV charged a seven-member commission with preparing a peace agreement. The efforts were later abandoned and the war continued. On 27 August 1557, Fernando Alvarez de Toledo, Duke of Alba and Viceroy of Naples, was at the walls of Rome, ready to lead his troops for a final assault. On 13 September 1557, Cardinal Carlo Carafa signed a peace agreement, accepting all of the duke's conditions.[14]

By the end of the wars in 1559, Habsburg Spain had been established as the premier power of Europe, to the detriment of France. In France, Henry II was fatally wounded in a joust held during the celebrations of the peace. His death led to the accession of his 15-year-old son Francis II, who in turn soon died. The French monarchy was thrown into turmoil, which increased further with the outbreak of the French Wars of Religion that would last for several decades. The states of Italy were reduced to second-rate powers, and Milan and Naples were annexed directly to Spain. Mary Tudor's death in 1558 enabled Philip to seal the treaty by marrying Henry II's daughter, Elisabeth of Valois, later giving him a claim to the throne of France on behalf of his daughter by Elisabeth, Isabel Clara Eugenia.

The French Wars of Religion (1562–98) were primarily fought between French Catholics and Protestants (Huguenots). The conflict involved the factional disputes between the aristocratic houses of France, such as the House of Bourbon and House of Guise (Lorraine), and both sides received assistance from foreign sources.

Philip signed the Treaty of Vaucelles with Henry II of France in 1556. Based on the terms of the treaty, the territory of the Franche-Comté was to be relinquished to Philip. However, the treaty was broken shortly afterwards. France and Spain waged war in northern France and Italy over the following years. Spanish victories at St. Quentin and Gravelines led to the Treaty of Cateau-Cambresis, in which France recognised Spanish sovereignty over the Franche-Comté.

Philip financed the Catholic League during the French Wars of Religion. He directly intervened in the final phases of the wars (1589–1598), ordering the Duke of Parma into France in an effort to unseat Henry IV, and perhaps dreaming of placing his favourite daughter, Isabel Clara Eugenia, on the French throne. Elizabeth of Valois, Philip's third wife and Isabella's mother, had already ceded any claim to the French Crown with her marriage to Philip. However the Parlement de Paris, in power of the Catholic party, gave verdict that Isabella Clara Eugenia was "the legitimate sovereign" of France. Philip's interventions in the fighting – sending the Duke of Parma, to end Henry IV's siege of Paris in 1590 – and the siege of Rouen in 1592 contributed in saving the French Catholic Leagues's cause against a Protestant monarchy.

In 1593, Henry agreed to convert to Catholicism; weary of war, most French Catholics switched to his side against the hardline core of the Catholic League, who were portrayed by Henry's propagandists as puppets of a foreign monarch, Philip. By the end of 1594 certain League members were still working against Henry across the country, but all relied on the support of Spain. In January 1595, therefore, Henry officially declared war on Spain, to show Catholics that Philip was using religion as a cover for an attack on the French state, and Protestants that he had not become a puppet of Spain through his conversion, while hoping to take the war to Spain and make territorial gain.[17]

The 1598 Treaty of Vervins was largely a restatement of the 1559 Peace of Câteau-Cambrésis and Spanish forces and subsidies were withdrawn; meanwhile, Henry issued the Edict of Nantes, which offered a high degree of religious toleration for French Protestants. The military interventions in France thus failed to oust Henry from the throne or suppress Protestantism in France, and yet they had played a decisive part in helping the French Catholic cause gain the conversion of Henry, ensuring that Catholicism would remain France's official and majority faith – matters of paramount importance for the devoutly Catholic Spanish king.

In the early part of his reign Philip was concerned with the rising power of the Ottoman Empire under Suleiman the Magnificent. Fear of Islamic domination in the Mediterranean caused him to pursue an aggressive foreign policy.

In 1558, Turkish admiral Piyale Pasha captured the Balearic Islands, especially inflicting great damage on Menorca and enslaving many, while raiding the coasts of the Spanish mainland. Philip appealed to the Pope and other powers in Europe to bring an end to the rising Ottoman threat. Since his father's losses against the Ottomans and against Hayreddin Barbarossa in 1541, the major European sea powers in the Mediterranean, namely Spain and Venice, became hesitant in confronting the Ottomans. The myth of "Turkish invincibility" was becoming a popular story, causing fear and panic among the people.

On 12 March 1560, the Holy League captured the island of Djerba, which had a strategic location and could control the sea routes between Algiers and Tripoli. As a response, Suleiman sent an Ottoman fleet of 120 ships under the command of Piyale Pasha, which arrived at Djerba on 9 May 1560. The battle lasted until 14 May 1560, and the forces of Piyale Pasha and Turgut Reis (who joined Piyale Pasha on the third day of the battle) won an overwhelming victory at the Battle of Djerba. The Holy League lost 60 ships (30 galleys) and 20,000 men, and Giovanni Andrea Doria was barely able to escape with a small vessel. The Ottomans retook the Fortress of Djerba, whose Spanish commander, D. Álvaro de Sande, attempted to escape with a ship but was followed and eventually captured by Turgut Reis. In 1565 the Ottomans sent a large expedition to Malta, which laid siege to several forts on the island, taking some of them. The Spanish sent a relief force, which finally drove the Ottoman army out of the island.

The grave threat posed by the increasing Ottoman domination of the Mediterranean was reversed in one of history's most decisive battles, with the destruction of nearly the entire Ottoman fleet at the Battle of Lepanto in 1571, by the Holy League under the command of Philip's half brother, Don Juan of Austria. A fleet sent by Philip, again commanded by Don John, reconquered Tunis from the Ottomans in 1573. The Turks soon rebuilt their fleet, and in 1574 Uluç Ali Reis managed to recapture Tunis with a force of 250 galleys and a siege that lasted 40 days. Nevertheless, Lepanto marked a permanent reversal in the balance of naval power in the Mediterranean and the end of the threat of Ottoman control.

Philip's rule in the Seventeen Provinces known collectively as the Netherlands faced many difficulties, leading to open warfare in 1568. He appointed Margaret of Parma as Governor of the Netherlands, when he left the low countries for Spain in 1559, but forced her to adjust policy to the advice of Cardinal Granvelle, who was greatly disliked in the Netherlands, after he insisted on direct control over events in the Netherlands despite being over two weeks' ride away in Madrid. There was discontent in the Netherlands about Philip's taxation demands and the incessant persecution of Protestants. In 1566, Protestant preachers sparked anti-clerical riots known as the Iconoclast Fury; in response to growing Protestant influence, the army of the Iron Duke (Fernando Álvarez de Toledo, 3rd Duke of Alba) went on the offensive, further alienating the local aristocracy. There were massacres of civilians in Mechelen, Naarden, Zutphen and Haarlem. In 1572 a prominent exiled member of the Dutch aristocracy, William the Silent (Prince of Orange), invaded the Netherlands with a Protestant army, but he only succeeded in holding two provinces, Holland and Zeeland.

Rampant inflation and the loss of treasure fleets from the New World prevented Spain from paying its soldiers consistently, leading to the so-called Spanish Fury at Antwerp in 1576, where soldiers ran amuck through the streets, burning more than 1,000 homes and killing 8,000 citizens. On January 31, 1578, the Spanish drove the Dutch patriots out of Namur and then pursued vigorously. At Gembloux, the retreating rear guard was taken in the flank and routed. The main Netherlands force was then assaulted by the Spaniards and destroyed. In return for no more than 12 men slain, the Spanish killed or captured as many as 8,000.

The States General of the northern provinces, united in the 1579 Union of Utrecht, passed an Act of Abjuration declaring that they no longer recognised Philip as their king. The southern Netherlands (what is now Belgium and Luxembourg) remained under Spanish rule. In 1584, William the Silent was assassinated by Balthasar Gérard, after Philip had offered a reward of 25,000 crowns to anyone who killed him, calling him a "pest on the whole of Christianity and the enemy of the human race". The Dutch forces continued to fight on under Orange's son Maurice of Nassau, who received modest help from Queen Elizabeth I in 1585. The Dutch gained an advantage over the Spanish because of their growing economic strength, in contrast to Philip's burgeoning economic troubles. The war came to an end in 1648, when the Dutch Republic was recognised by Spain as independent.

Titian portrait of Philip as prince (1554), aged about twenty-four dressed in a lavishly decorated set of armour.

Philip's father arranged his marriage to 37-year-old Queen Mary I of England, Charles' maternal first cousin. His father ceded the crown of Naples, as well as his claim to the Kingdom of Jerusalem, to him. Their marriage at Winchester Cathedral on 25 July 1554 took place just two days after their first meeting. Philip's view of the affair was entirely political. Lord Chancellor Gardiner and the House of Commons petitioned Mary to consider marrying an Englishman, preferring Edward Courtenay.

Under the terms of the Act for the Marriage of Queen Mary to Philip of Spain, Philip was to enjoy Mary I's titles and honours for as long as their marriage should last. All official documents, including Acts of Parliament, were to be dated with both their names, and Parliament was to be called under the joint authority of the couple. Coins were also to show the heads of both Mary and Philip. The marriage treaty also provided that England would not be obliged to provide military support to Philip's father in any war. The Privy Council instructed that Philip and Mary should be joint signatories of royal documents, and this was enacted by an Act of Parliament, which gave him the title of king and stated that he "shall aid her Highness ... in the happy administration of her Grace’s realms and dominions."[20] In other words, Philip was to co-reign with his wife.[21] As the new King of England could not read English, it was ordered that a note of all matters of state should be made in Latin or Spanish.[21][22][23]

Philip and Mary I of England, 1558

Acts making it high treason to deny Philip's royal authority were passed in Ireland[24] and England.[25] Philip and Mary appeared on coins together, with a single crown suspended between them as a symbol of joint reign. The Great Seal shows Philip and Mary seated on thrones, holding the crown together.[21] The coat of arms of England was impaled with Philip's to denote their joint reign.[26][27] During their joint reign, they waged war against France, which resulted in the loss of Calais, England's last remaining possession in France.

Philip's wife had succeeded to the Kingdom of Ireland, but the title of King of Ireland had been created in 1542 by Henry VIII after he was excommunicated, and so it was not recognised by Catholic monarchs. In 1555, Pope Paul IV rectified this by issuing a papal bull recognising Philip and Mary as rightful King and Queen of Ireland.[28]King's County and Philipstown in Ireland were named after Philip as King of Ireland in 1556. The couple's joint royal style after Philip ascended the Spanish throne in 1556 was: Philip and Mary, by the Grace of God King and Queen of England, Spain, France, Jerusalem, both the Sicilies and Ireland, Defenders of the Faith, Archdukes of Austria, Dukes of Burgundy, Milan and Brabant, Counts of Habsburg, Flanders and Tirol.

However, the couple had no children. Mary died in 1558 before the union could revitalise the Roman Catholic Church in England. With her death, Philip lost his rights to the English throne (including the ancient English claims to the French throne) and ceased to be King of England, Ireland and (as claimed by them) France.

Upon Mary's death, the throne went to Elizabeth I. Philip had no wish to sever his tie with England, and had sent a proposal of marriage to Elizabeth. However, she delayed in answering, and in that time learned Philip was also considering a Valois alliance. Elizabeth I was the Protestant daughter of Henry VIII and Anne Boleyn. This union was deemed illegitimate by English Catholics, who disputed the validity of both the annulment of Henry's marriage to Catherine of Aragon and of his subsequent marriage to Boleyn, and hence claimed that Mary, Queen of Scots, the Catholic great granddaughter of Henry VII, was the legitimate heir to the throne.

For many years Philip maintained peace with England, and even defended Elizabeth from the Pope's threat of excommunication. This was a measure taken to preserve a European balance of power. Ultimately, Elizabeth allied England with the Protestant rebels in the Netherlands. Further, English ships began a policy of piracy against Spanish trade and threatened to plunder the great Spanish treasure ships coming from the new world. English ships went so far as to attack a Spanish port. The last straw for Philip was the Treaty of Nonsuch signed by Elizabeth in 1585 – promising troops and supplies to the rebels. Although it can be argued this English action was the result of Philip's Treaty of Joinville with the Catholic League of France, Philip considered it an act of war by England.

The execution of Mary, Queen of Scots, in 1587 ended Philip's hopes of placing a Catholic on the English throne. He turned instead to more direct plans to invade England and return the country to Catholicism. In 1588, he sent a fleet, the Spanish Armada, to rendezvous with the Duke of Parma's army and convey it across the English Channel. However, the operation had little chance of success from the beginning, because of lengthy delays, lack of communication between Philip II and his two commanders and the lack of a deep bay for the fleet. At the point of attack, a storm struck the English Channel, already known for its harsh currents and choppy waters, which devastated large numbers of the Spanish fleet. There was a tightly fought battle against the English Royal Navy; it was by no means a slaughter (only 5 Spanish ships were destroyed), but the Spanish were forced into a retreat, and the overwhelming majority of the Armada was destroyed by the harsh weather. Most of Spain's casualties resulted when sailors died of or were incapacitated from disease and exposure, not from battle wounds. Whilst the English Royal Navy may not have destroyed the Armada at the Battle of Gravelines, they had prevented it from linking up with the army it was supposed to convey across the channel. Thus whilst the English Royal Navy may have only won a slight tactical victory over the Spanish, it had delivered a major strategic one—preventing the invasion of England.

Eventually, three more Armadas were assembled; two were sent to England in 1596 and 1597, but both also failed; the third (1599) was diverted to the Azores and Canary Islands to fend off raids. This Anglo-Spanish War (1585–1604) would be fought to a grinding end, but not until both Philip II (d. 1598) and Elizabeth I (d. 1603) were dead.

The defeat of the Spanish Armada gave great heart to the Protestant cause across Europe. The storm that smashed the Armada was seen by many of Philip's enemies as a sign of the will of God. Many Spaniards blamed the admiral of the Armada for its failure, but Philip, despite his complaint that he had sent his ships to fight the English, not the elements, was not among them. A year later, Philip remarked:

“

It is impiety, and almost blasphemy to presume to know the will of God. It comes from the sin of pride. Even kings, Brother Nicholas, must submit to being used by God's will without knowing what it is. They must never seek to use it.

”

— Philip II

The Spanish navy was rebuilt, and intelligence networks were improved. A measure of the character of Philip can be gathered by the fact that he personally saw to it that the wounded men of the Armada were treated and received pensions, and that the families of those who died were compensated for their loss, which was highly unusual for the time.

While the invasion had been averted, England was unable to take advantage of this success. An attempt to use her newfound advantage at sea with an English Counter Armada the following year failed disastrously. Likewise, English buccaneering and attempts to seize territories in the Caribbean were defeated by Spain's rebuilt navy and their improved intelligence networks (although Cádiz was destroyed by an Anglo-Dutch force after a failed attempt to seize the treasure fleet).

Under Philip II, Spain reached the peak of its power. However, in spite of the great and increasing quantities of gold and silver flowing into his coffers from the American mines, the riches of the Portuguese spice trade, and the enthusiastic support of the Habsburg dominions for the Counter-Reformation, he would never succeed in suppressing Protestantism or defeating the Dutch rebellion. Early in his reign, the Dutch might have laid down their weapons if he had desisted in trying to suppress Protestantism,[citation needed] but his devotion to Catholicism would not permit him to do so. He was a devout Catholic and exhibited the typical 16th century disdain for religious heterodoxy; he said, "Before suffering the slightest damage to religion in the service of God, I would lose all of my estates and a hundred lives, if I had them, because I do not wish nor do I desire to be the ruler of heretics."[30]

England and Philip parted ways after the death of his Queen, nicknamed "Bloody Mary". Philip's gravest mistake over the long run was his attempt to violently eradicate Protestantism from the Netherlands, which was a major economic asset for the empire. Under harsh occupation, the Dutch finally rebelled and wrested independence after an 80-year war, the strain of which did Philip's realm little good. His greatest battlefield accomplishment was the defeat of the Ottoman fleet at Lepanto, which turned the tide against Turkish aggression.

As he strove to enforce Catholic orthodoxy through an intensification of the Inquisition, students were barred from studying elsewhere, and books printed by Spaniards outside the kingdom were banned. Even a highly respected churchman like Archbishop Carranza of Toledo was jailed by the Inquisition for 17 years, for publishing ideas that seemed sympathetic in some degree with Protestantism. Such strict enforcement of orthodox belief was successful, and Spain avoided the religiously inspired strife tearing apart other European dominions.

Yet, the School of Salamanca flourished under his reign. Martín de Azpilcueta, highly honoured at Rome by several popes and looked on as an oracle of learning, published his Manuale sive Enchiridion Confessariorum et Poenitentium (Rome, 1568), long a classical text in the schools and in ecclesiastical practice.

Francisco Suárez, generally regarded as the greatest scholastic after Thomas Aquinas and regarded during his lifetime as being the greatest living philosopher and theologian, was writing and lecturing, not only in Spain but also in Rome (1580–1585), where Pope Gregory XIII attended the first lecture that he gave. Luis de Molina published his De liberi arbitrii cum gratiae donis, divina praescientia, praedestinatione et reprobatione concordia (1588), wherein he put forth the doctrine attempting to reconcile the omniscience of God with human free will that came to be known as Molinism, thereby contributing to what was one of the most important intellectual debates of the time; Molinism became the de factoJesuit doctrine on these matters, and is still advocated today by William Lane Craig and Alvin Plantinga, among others.

Because Philip II was the most powerful European monarch in an era of war and religious conflict,[31] evaluating both his reign and the man himself has become a controversial historical subject.[32] Even before his death in 1598, his supporters had started presenting him as an archetypical gentleman, full of piety and Christian virtues, whereas his enemies depicted him as a fanatical and despotic monster, responsible for inhuman cruelties and barbarism.[33] This dichotomy, further developed into the so-called Spanish Black Legend and White Legend, was helped by King Philip himself. Philip prohibited any biographical account of his life to be published while he was alive, and he ordered that all his private correspondence be burned shortly before he died.[34] Moreover, Philip did nothing to defend himself after being betrayed by his ambitious secretary Antonio Perez, who published incredible calumnies against his former master; this allowed Perez's tales to spread all around Europe unchallenged.[35] That way, the popular image of the king that survives to today was created on the eve of his death, at a time when many European princes and religious leaders were turned against Spain as a pillar of the Counter-Reformation. This means that many histories depict Philip from deeply prejudiced points of view, usually negative.[36]

However, some historians classify this anti-Spanish analysis as part of the Black Legend. In a more recent example of popular culture, Philip II's portrayal in Fire Over England (1937) is not entirely unsympathetic; he is shown as a very hardworking, intelligent, religious, somewhat paranoid ruler whose prime concern is his country, but who had no understanding of the English, despite his former co-monarchy there.

Even in countries that remained Catholic, primarily France and the Italian states, fear and envy of Spanish success and domination created a wide receptiveness for the worst possible descriptions of Philip II. Although some efforts have been made to separate legend from reality,[37] that task has proved extremely difficult, since many prejudices are rooted in the cultural heritage of European countries. Spanish-speaking historians tend to assess his political and military achievements, sometimes deliberately avoiding issues such as the king's lukewarmness (or even support) toward Catholic fanaticism.[38] English-speaking historians tend to show Philip II as a fanatical, despotical, criminal, imperialist monster,[39] minimising his military victories (Battle of Lepanto, Battle of Saint Quentin, etc.) to mere anecdotes, and magnifying his defeats (namely the Invincible Armada[40]) even though at the time those defeats did not result in great political or military changes in the balance of power in Europe. Moreover, it has been noted that objectively assessing Philip's reign would necessitate a re-analysis of the reign of his greatest opponents, namely England's Queen Elizabeth I and the Dutch William the Silent, who are popularly regarded as great heroes in their home nations; if Philip II is to be shown to the English or Dutch public in a more favourable light, Elizabeth and William would lose their cold-blooded, fanatical enemy, thus decreasing their own patriotic accomplishments.[41]

Philip II's reign can hardly be characterised by its failures. He ended French Valois ambitions in Italy and brought about the Habsburg ascendency in Europe. He commenced settlements in the Philippines, which were named after him,[b] and established the first trans-Pacific trade route between America and Asia. He secured the Portuguese kingdom and empire. He succeeded in increasing the importation of silver in the face of English, Dutch, and French privateers, overcoming multiple financial crises and consolidating Spain's overseas empire. Although clashes would be ongoing, he ended the major threat posed to Europe by the Ottoman navy.

King of Castile, of León, of Granada, of Toledo, of Galicia, of Seville, of Cordoba, of Murcia, of Jaen, of the Algarves, of Algeciras, of Gibraltar, of the Canary Islands, of the Indias, the Islands and Mainland of the Ocean Sea.[c] Lord of Molina.

His coinage typically bore the obverse inscription "PHS·D:G·HISP·Z·REX" (Latin: "Philip, by the grace of God King of Spain et cetera"), followed by the local title of the mint ("DVX·BRA" for Duke of Brabant, "C·HOL" for Count of Holland, "D·TRS·ISSV" for Lord of Overissel, &c.). The reverse would then bear a motto such as "PACE·ET·IVSTITIA" ("For Peace and Justice") or "DOMINVS·MIHI·ADIVTOR" ("The Lord is my helper").[45] A medal struck in 1583 bore the inscriptions "PHILIPP II HISP ET NOVI ORBIS REX" ("Philip II, King of Spain and the New World") and "NON SUFFICIT ORBIS" ("The world is not enough").[46]

Philip's second wife was his first cousin once removed, Queen Mary I of England. The marriage, which took place on 25 July 1554 at Winchester Cathedral, was political. By this marriage, Philip became jure uxorisKing of England and Ireland, although the couple was apart more than together as they ruled their respective countries. The marriage produced no children, although there was a false pregnancy, and Mary died in 1558, ending Philip's reign in England and Ireland.

Philip's third wife was Elisabeth of Valois, the eldest daughter of Henry II of France and Catherine de' Medici. She was also a distant relation of Philip – she was descended from their mutual ancestor Alfonso VII of León and Castile. The original ceremony was conducted by proxy (the Duke of Alba standing in for Philip) at Notre Dame prior to Elisabeth's departure from France. The actual ceremony was conducted in Guadalajara upon her arrival in Spain. During their marriage (1559–1568) they conceived five daughters and a son, though only two of the girls survived. Elisabeth died a few hours after the loss of her last child. Their children were:

Philip's fourth and final wife was his niece, Anna of Austria. By contemporary accounts, this was a convivial and satisfactory marriage (1570–1580) for both Philip and Anna. This marriage produced four sons and one daughter. Anna died of heart failure 8 months after giving birth to Maria in 1580. Their children were:

^The Philippine archipelago was first sighted by Ferdinand Magellan on his expedition to the Spice Islands, but it was during Philip's reign that Spanish explorer Ruy Lopez de Villalobos renamed them from the archipelago of St. Lazarus to Las Islas Filipinas in Philip's honour.

^With la incorporation of Portugal to the Monarchy the title changed to East and West Indies, the Islands and Mainland of the Ocean sea.

^As Philip wrote in 1566 to Luis de Requesens: "You can assure his Holiness that rather than suffer the least injury to religion and the service of God, I would lose all my states and a hundred lives if I had them, for I do not intend to rule over heretics." Pettegree 2002, p. 214.

^Fernand Braudel, The Mediterranean and the Mediterranean World in the Age of Philip II, vol. 2 (Berkeley: University of California Press, 1995), 935–36 and notes.

^Fernández Álvarez, Manuel. Felipe II y su tiempo. Espasa Calpe, Madrid, 6th Ed. ISBN84-239-9736-7 In the introduction to this work, Felipe is mentioned as the most powerful European monarch by resources and army, depicting Europe at the time as a world full of unsolved issues and religious conflicts

^Kamen, Henry. Felipe de España, Madrid, Siglo XXI, 1997. Cultural depictions of the king are mentioned, although Kamen tends to place himself with those favouring the king

^Fernández Álvarez, Manuel. Felipe II y su tiempo. Espasa Calpe, Madrid, 6th Ed. ISBN84-239-9736-7. He discusses the lack of correspondence of the king because he ordered it burned, thus avoiding any chance of getting further into Philip's private life.

^Hume, Martin. Philip II of Spain, London, 1897. Martin tried to retrieve the prejudiced views on the king at his time, something Carl Bratli also tried to do in his Filip of Spanien (Koebenhaven, 1909). Their works oppose to those of Ludwig Pfandl, Felipe II. Bosquejo de una vida y un tiempo, Munich, 1938, who assessed very negatively Felipe's personality

^In his work, Felipe II (Madrid, 1943) W.T. Walsh depicts Felipe's reign as a prosperous and successful one, tending to make an apology of it. Fernández Álvarez, in España y los españoles en la Edad Moderna (Salamanca, 1979), points out how White Legend supporters flourished during the 1940s and 1950s, and how they omitted the darkest issues of Felipe's reign

^Cabrera de Córdoba, Felipe II rey de España, ed. RAH, 1877, criticizes how Felipe's victories are being minimised by English historians, and points out the small consequences of defeats such as the Invincible Armada

^This appreciation is noted by Martin Hume in his aforementioned work ("Philip II of Spain", London 1897), pointing out how difficult is to show Philip II in a more favorable light to his fellow Englishmen because of that.

Patterson, Benton Rain. With the Heart of a King: Elizabeth I of England, Philip II of Spain & the Fight for a Nation's Soul & Crown (2007)

Rodriguez-Salgado, M.J. "The Court of Philip II of Spain". In Princes Patronage and the Nobility: The Court at the Beginning of the Modern Age, cc. 1450–1650. Edited by Ronald G. Asch and Adolf M. Birke. New York: Oxford University Press, 1991. ISBN0-19-920502-7.

Parker, Geoffrey. Imprudent King: A New Life of Philip II (2014), a major scholarly bio

The generations indicate descent from Carlos I, under whom the crowns of Castile and Aragon were united, forming the Kingdom of Spain. Previously, the title Infante had been largely used in the different realms.